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If tan^-1(2/p)+tan^-1(3/p)+tan^-1(4/p)+t...

If `tan^-1(2/p)+tan^-1(3/p)+tan^-1(4/p)+tan^-1(5/p)=pi/2` then `(p^2+120/p^2)` is equal to (1)70 (2)71 (3) 72 (4) 74

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